NOIP-2009 表达式输出

老实说，我写的并不十分好。

/*
 * NOIP-2009-A-A 多项式输出
 * mike-w
 * 2011-10-12
 * KISS principle
 */
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<assert.h>
#define MAXN 111

int p[MAXN];
int N;

int main(void)
{
	int i;
	scanf("%d",&N);
	for(i=1;i<=N+1;i++)
		scanf("%d",p+N-i+1);

	for(i=N;i>=0;i--)
		if(p[i])
			break;
	if(i==0)
	{
		printf("%d\n",p[i]);
		return 0;
	}
	else if(i==1) printf("%dx",p[i]);
	else if(p[i]<-1) printf("%dx^%d",p[i],i);
	else if(p[i]==-1) printf("-x^%d",i);
	else if(p[i]>1) printf("%dx^%d",p[i],i);
	else printf("x^%d",i);

	for(i--;i>0;i--)
	{
		if(i>1)
		{
			if(p[i]==0)	continue;
			if(p[i]>1) printf("+%dx^%d",p[i],i);
			else if(p[i]==1) printf("+x^%d",i);
			else if(p[i]==-1) printf("-x^%d",i);
			else printf("%dx^%d",p[i],i);
		}
		else
		{
			if(p[i]==0)	continue;
			if(p[i]>1) printf("+%dx",p[i]);
			else if(p[i]==1) printf("+x");
			else if(p[i]==-1) printf("-x");
			else printf("%dx",p[i]);
		}
	}

	if(p[0]>0)
		printf("+%d\n",p[0]);
	else if(p[0]<0)
		printf("%d\n",p[0]);
	else
		putchar('\n');

	return 0;
}